Seiko Cal. 5640 - 621

The Seiko 5640-621 represents an important milestone in Seiko's 1978 lineup. The Fixed bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-231477bf1bd8]

Also known as: Navigator, Crown

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Burgundy

Jewels

19j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1978

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